<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>4.createRef的使用</title>
    <!-- 引入react核心库 -->
    <script src="../React-js/react.development.js"></script>
    <!-- 引入react-dom,用于支持react操作DOM -->
    <script
      type="text/javascript"
      src="../React-js/react-dom.development.js"
    ></script>
    <!-- 引入babel,用于将jsx转换为js -->
    <script type="text/javascript" src="../React-js/babel.min.js"></script>
  </head>
  <body>
    <!-- 准备好一个“容器” -->
    <div id="test"></div>

    <script type="text/babel">
      class MyComponent extends React.Component {
        /* React.createRef调用后可以放回一个容器,该容器可以存储被ref所标识的节点,该容器"专人专用" */
        myRef = React.createRef();

        textInput = () => {
          console.log(this.myRef.current.value);
        };

        render() {
          return (
            <div>
              <input ref={this.myRef} type="text" placeholder="请输入数据" />
              <button onClick={this.textInput}>点我提示输入数据</button>
            </div>
          );
        }
      }

      ReactDOM.render(<MyComponent />, document.getElementById('test'));
    </script>
  </body>
</html>
